There are 8 books in the Dragon Blood series. The newest book is Oaths which came out in 2018.

Colonel Ridge Zirkander isn’t the model of military professionalism—he has a tendency to say exactly what’s on his mind, and his record has enough demerits to wallpaper the hull of an airship—but as the best fighter pilot in the Iskandian army, he’s used to a little leniency from his superiors.…
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2
Deathmaker

Book cover of Deathmaker
When Lieutenant Caslin Ahn joined Wolf Squadron, she was prepared for the reality that she might one day be killed in the line of duty. She was less prepared for being shot down, assumed dead by her own people, and dragged off to the Cofah Empire as a prisoner of…

3
Blood Charged

Book cover of Blood Charged
Sardelle Terushan, sorceress and healer, should be lying low. Magic is forbidden in Iskandia, and magic users are drowned, shot, or otherwise slain. The problem? She's fallen in love with ace fighter pilot and national hero, Colonel Ridge Zirkander, a man whom everybody notices, including the king. It's not long…

4
Patterns in the Dark

Book cover of Patterns in the Dark
Everyone knows dragons have been extinct for over a thousand years. Everyone is wrong. At least one dragon remains, and military scientists from the Cofah Empire are experimenting with its blood, using the magical substance to power deadly new weapons that could be used to bring the world to its…

5
The Blade's Memory

Book cover of The Blade's Memory
Ridge, Sardelle, and their comrades may have rescued Tolemek’s sister and freed the dragon, but trouble awaits at home. The king is missing, a secret organization is hunting sorcerers, and the capital is more vulnerable than ever to enemy attack. Worst of all, at least from Ridge's point of view,…

6
Raptor

Book cover of Raptor
Responsible for her friend’s death, Lieutenant Caslin Ahn wants nothing more than to be left alone. She no longer deserves the company of comrades or the fulfillment she felt as a Wolf Squadron fighter pilot. But a summons from the king leaves her with no choice but to rejoin her…

7
Soulblade

Book cover of Soulblade
It’s been a week since the dragon Morishtomaric fell, and Sardelle is not convinced that Ridge is truly gone. With a companion who thinks he’s a god and a soldier who would happily kill her, she heads back to the mountains to look for signs that Ridge survived. What they…

8
Oaths

Book cover of Oaths
General Ridgewalker Zirkander is getting married. Sardelle—the woman who’s battled dragons, shamans, and countless enemy soldiers at his side—has accepted his proposal, and it’s the perfect time for a wedding. It’s been two months since any dragons or sorceresses attacked the city, the Cofah haven’t come after their kidnapped emperor,…